Test JS script file

Selected file: 051null_comparison.js
Compare console.log() outputs in browser and NodeJS.
Notice: Open browser's console in FireBUG!

  1. 001syntax_unicode.js
  2. 010number_DecToHex.js
  3. 011number_HexToDec.js
  4. 012number_toExponential.js
  5. 013number_modulo.js
  6. 014number_division_by_zero.js
  7. 015number_NaN.js
  8. 016number_infinity.js
  9. 017number_isFinite.js
  10. 018number_isNaN.js
  11. 019number_negative_zero.js
  12. 020number_float_rounding_error.js
  13. 030string_htmlTags.js
  14. 030string_multiline.js
  15. 031string_length.js
  16. 032string_concatenate.js
  17. 032string_concatenate2.js
  18. 033string_minus.js
  19. 035stringmethods_charAt.js
  20. 035stringmethods_concate.js
  21. 035stringmethods_indexOf.js
  22. 035stringmethods_match.js
  23. 035stringmethods_match_memory.js
  24. 035stringmethods_replace.js
  25. 035stringmethods_search.js
  26. 035stringmethods_split.js
  27. 035stringmethods_toString.js
  28. 035stringmethods_toUpperCase.js
  29. 035stringmethods_trim.js
  30. 036string_regexTest.js
  31. 040bool_falsy.js
  32. 040bool_truthy.js
  33. 041bool_comparison.js
  34. 042bool_conditional_operator.js
  35. 043bool_logic_operators.js
  36. 044bool_not_exe_function.js
  37. 050null_typeof.js
  38. 051null_comparison.js
  39. 053undefined_var.js
  40. 054ReferenceError.js
  41. 055global_object_browser.js
  42. 055global_object_node.js
  43. 056global_properties_browser.js
  44. 056global_properties_node.js
  45. 057wrapper_object.js
  46. 058wrapper_object_readonly.js
  47. 60object_reference.js

..:: Source code - 051null_comparison.js ::..

/**
 * comparison of null and empty string
 */

console.log(Boolean('' == null)); //false
console.log(Boolean('' === null)); //false
console.log(Boolean(0 === null)); //false
console.log(Boolean({} === null)); //false
console.log(Boolean({} == null)); //false

console.log('--------------');

var x = null;
if (!x) {
 console.log('x is null');
} else {
 console.log('x is not null');
}
 

..:: NodeJS Console - 051null_comparison.js ::..

$ node 051null_comparison.js 
false
false
false
false
false
--------------
x is null

$ps -aux | grep node (list all node processes)
sasa         849  0.5  0.5 1318144 86636 ?       Ssl  Oct08 283:01 node /home/sasa/regoch/regoch-www/server
sasa         880  0.4  0.5 1319240 87332 ?       Ssl  Oct08 235:37 node /home/sasa/dex8/dex8-www/server/index.js
sasa         890  0.5  0.5 11797800 85680 ?      Ssl  Oct08 334:18 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         903  0.7  0.4 1329652 81692 ?       Ssl  Oct08 430:48 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         929  0.4  0.4 1300184 68968 ?       Ssl  Oct08 226:10 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa         943  0.4  0.4 1300808 66948 ?       Ssl  Oct08 233:17 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa         980  0.6  0.5 11805104 92464 ?      Ssl  Oct08 364:31 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa         981  0.7  0.6 1148036 103812 ?      Ssl  Oct08 394:54 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1039  0.9  1.4 11953572 245704 ?     Ssl  Oct08 554:57 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa     2044488  0.3  0.4 1298112 67172 ?       Ssl  Nov01  77:16 node /home/sasa/dex8/dex8-panel/server/index.js
sasa     2574087  0.3  0.4 11792920 77084 ?      Ssl  Nov08  41:51 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     2702010  0.4  0.6 22296952 100512 ?     Ssl  Nov10  35:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702011  0.3  0.4 1100276 66664 ?       Ssl  Nov10  31:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702018  0.3  0.3 1099884 65084 ?       Ssl  Nov10  31:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702019  0.3  0.4 1100516 66332 ?       Ssl  Nov10  31:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702046  0.9  0.7 22311780 123996 ?     Ssl  Nov10  84:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702047  0.3  0.3 1099492 65412 ?       Ssl  Nov10  31:28 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702088  0.3  0.4 1100008 66460 ?       Ssl  Nov10  31:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702089  0.3  0.4 1099752 66576 ?       Ssl  Nov10  31:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702137  0.3  0.4 1099864 66044 ?       Ssl  Nov10  31:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2702139  0.4  0.6 22297196 102516 ?     Ssl  Nov10  35:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3097623  1.1  0.8 11716736 131300 ?     Ssl  Nov13  44:00 node /home/sasa/dex8/dex8-api/starter.js
www-data 3364486  0.0  0.0   2608   604 ?        S    08:03   0:00 sh -c ps -aux | grep node
www-data 3364488  0.0  0.0   3304   720 ?        S    08:03   0:00 grep node